/* ============================================
   Prashant Rawat Portfolio - Main Stylesheet
   Modern, responsive, production-ready
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-accent: #06b6d4;
  --color-success: #10b981;
  --color-bg: #f1f5f9;
  --color-card: #ffffff;
  --color-text: #334155;
  --color-text-light: #64748b;
  --color-text-heading: #0f172a;
  --color-border: #e2e8f0;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
  --container-width: 1100px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary-dark);
}

h1, h2, h3, h4 {
  color: var(--color-text-heading);
  line-height: 1.3;
}

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* --- Header / Navigation --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo img {
  border-radius: 6px;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}

.nav-list a {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-list a:hover,
.nav-list a.active {
  background: var(--color-primary);
  color: #fff;
}

/* Hamburger toggle (mobile) */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
  position: relative;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-heading);
  border-radius: 2px;
  transition: all var(--transition);
  position: absolute;
  left: 8px;
}

.hamburger { top: 19px; }
.hamburger::before { content: ''; top: -7px; }
.hamburger::after { content: ''; top: 7px; }

.nav-toggle[aria-expanded="true"] .hamburger { background: transparent; }
.nav-toggle[aria-expanded="true"] .hamburger::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .hamburger::after { top: 0; transform: rotate(-45deg); }

/* --- Hero Section --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.85), rgba(37, 99, 235, 0.6));
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 2rem;
}

.avatar-wrapper {
  margin-bottom: 1.5rem;
}

.avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.3);
  object-fit: cover;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.25rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: 1.5rem;
}

.hero-social {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  font-size: 1.1rem;
  transition: background var(--transition), transform var(--transition);
}

.hero-social a:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-3px);
  color: #fff;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
  transform: translateY(-2px);
}

/* --- Sections --- */
.section {
  padding: 1.5rem 0;
}

.card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 3rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 3px solid var(--color-primary);
  display: inline-block;
}

.section-grid {
  display: grid;
  gap: 2.5rem;
}

.two-col {
  grid-template-columns: 1fr 1fr;
}

/* --- Bio Section --- */
.bio-info {
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
}

.bio-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.bio-row:last-child {
  border-bottom: none;
}

.bio-label {
  font-weight: 600;
  color: var(--color-text-heading);
  min-width: 110px;
  font-size: 0.9rem;
}

.bio-label i {
  width: 20px;
  color: var(--color-primary);
  margin-right: 0.5rem;
}

.bio-value {
  color: var(--color-text);
  font-size: 0.9rem;
  word-break: break-word;
}

/* --- Skills Section --- */
.skills-category {
  margin-bottom: 1.75rem;
}

.skills-category:last-child {
  margin-bottom: 0;
}

.skills-category-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 0.75rem;
}

.skills-category-title i {
  color: var(--color-primary);
  margin-right: 0.5rem;
  width: 20px;
  text-align: center;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  display: inline-block;
  padding: 0.4rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: 50px;
  transition: all var(--transition);
}

.skill-tag:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

/* --- Timeline --- */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -2rem;
  top: 6px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid;
  z-index: 2;
}

.marker-info { border-color: var(--color-accent); }
.marker-success { border-color: var(--color-success); }

.timeline-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.timeline-content .company {
  font-weight: 400;
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.timeline-date {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.timeline-content p {
  font-size: 0.95rem;
  color: var(--color-text);
}

/* --- Portfolio --- */
.project-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
}

.project-row:last-child {
  border-bottom: none;
}

.project-row.reverse .project-info {
  order: -1;
  text-align: right;
}

.project-media img {
  border-radius: var(--radius-sm);
  width: 100%;
  height: 250px;
  object-fit: cover;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}

.project-media img:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.video-thumbnail {
  position: relative;
  display: block;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.video-thumbnail img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform var(--transition), filter var(--transition);
}

.video-thumbnail:hover img {
  transform: scale(1.02);
  filter: brightness(0.75);
}

.play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: rgba(255, 0, 0, 0.85);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), background var(--transition);
}

.play-btn i {
  color: #fff;
  font-size: 1.25rem;
  margin-left: 3px;
}

.video-thumbnail:hover .play-btn {
  transform: translate(-50%, -50%) scale(1.1);
  background: rgba(255, 0, 0, 1);
}

.project-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 250px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(6, 182, 212, 0.08));
  border-radius: var(--radius-sm);
  border: 2px dashed rgba(37, 99, 235, 0.2);
}

.project-placeholder i {
  font-size: 4rem;
  color: var(--color-primary);
  opacity: 0.4;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.project-tag {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-accent);
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  border-radius: 50px;
}

.project-info h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-info p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- References --- */
.references-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 600px;
}

.reference-item {
  padding: 1.5rem;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--color-primary);
}

.reference-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.reference-avatar {
  border-radius: 50%;
  object-fit: cover;
}

.reference-header h3 {
  font-size: 1rem;
  margin-bottom: 0.1rem;
}

.reference-role {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

blockquote {
  position: relative;
  padding-left: 2rem;
}

.quote-icon {
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-primary);
  opacity: 0.3;
  font-size: 1.25rem;
}

blockquote p {
  font-size: 0.95rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.7;
}

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 3rem;
  align-items: start;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-item i {
  font-size: 1.1rem;
  color: var(--color-primary);
  width: 24px;
  text-align: center;
}

.contact-item a {
  color: var(--color-text);
  font-size: 0.95rem;
}

.contact-item a:hover {
  color: var(--color-primary);
}

/* Form */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: var(--font-main);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: 3rem 1rem;
  background: var(--color-card);
  border-top: 1px solid var(--color-border);
}

.footer-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-bg);
  color: var(--color-text);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.footer-social a:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition);
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-3px);
}

/* ================================
   Responsive Design
   ================================ */

/* Tablet */
@media (max-width: 768px) {
  /* Disable animations on mobile for performance */
  [data-aos] {
    opacity: 1 !important;
    transform: translate(0) scale(1) !important;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    gap: 0.25rem;
  }

  .nav-list a {
    padding: 0.75rem 1rem;
    font-size: 1rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .card {
    padding: 2rem 1.5rem;
  }

  .project-placeholder {
    height: 200px;
  }

  .two-col,
  .project-row,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .project-row.reverse .project-info {
    order: 0;
    text-align: left;
  }

  .project-media img {
    height: 200px;
  }

  .section-title {
    font-size: 1.5rem;
  }
}

/* Small Mobile */
@media (max-width: 480px) {
  .card {
    padding: 1.5rem 1rem;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .avatar {
    width: 120px;
    height: 120px;
  }

  .btn {
    padding: 0.65rem 1.25rem;
    font-size: 0.85rem;
  }

  .bio-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

/* --- Availability Badge --- */
.availability-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #6ee7b7;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.3rem 0.9rem;
  border-radius: 50px;
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
}

.availability-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* --- Hero Value Proposition --- */
.hero-value-prop {
  font-size: 1rem;
  font-weight: 400;
  opacity: 0.8;
  max-width: 560px;
  margin: 0 auto 1.75rem;
  line-height: 1.6;
}

/* --- Stats Bar --- */
.stats-bar {
  background: var(--color-text-heading);
  padding: 1.5rem 0;
}

.stats-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 2.5rem;
  border-right: 1px solid rgba(255, 255, 255, 0.12);
}

.stat-item:last-child {
  border-right: none;
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

/* --- Timeline Bullets --- */
.timeline-bullets {
  list-style: none;
  padding: 0;
  margin: 0;
}

.timeline-bullets li {
  font-size: 0.95rem;
  color: var(--color-text);
  padding: 0.3rem 0 0.3rem 1.25rem;
  position: relative;
  line-height: 1.6;
}

.timeline-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.65rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* --- Project Detail Blocks (Responsibilities / Key Tasks / Achievements) --- */
.project-detail-blocks {
  margin: 0.85rem 0 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.project-detail-block {
  background: rgba(37, 99, 235, 0.04);
  border-left: 3px solid var(--color-accent);
  padding: 0.5rem 0.85rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.project-detail-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
}

.project-detail-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.project-detail-list li {
  font-size: 0.875rem;
  color: var(--color-text-light);
  padding: 0.15rem 0 0.15rem 1rem;
  position: relative;
  line-height: 1.55;
}

.project-detail-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.6;
}

/* --- Project Filters --- */
.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.4rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-main);
  border: 2px solid var(--color-border);
  border-radius: 50px;
  background: transparent;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.project-row.hidden {
  display: none;
}

/* --- Open Source Section --- */
.opensource-subtitle {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  max-width: 650px;
}

.opensource-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.opensource-card {
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.opensource-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.opensource-card-img {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 1rem;
}

.opensource-card-img img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  transition: transform var(--transition);
}

.opensource-card:hover .opensource-card-img img {
  transform: scale(1.03);
}

.opensource-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--color-text-heading);
  margin-bottom: 0.5rem;
}

.opensource-card > p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
}

.opensource-card .pip-install {
  margin: 0.85rem 0;
}

.opensource-card-links {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.opensource-card-links a {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-light);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color var(--transition);
}

.opensource-card-links a:hover {
  color: var(--color-primary);
}

.opensource-read-more {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: auto;
  align-self: flex-end;
  transition: gap var(--transition);
}

.opensource-read-more:hover {
  gap: 0.6rem;
  color: var(--color-primary-dark);
}

.opensource-card .project-tags {
  margin-top: 0;
}

@media (max-width: 768px) {
  .opensource-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Pip Install Snippet --- */
.pip-install {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--color-text-heading);
  color: #e2e8f0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.5rem 0.85rem 0.5rem 1rem;
  border-radius: var(--radius-sm);
  margin: 0.75rem 0;
}

.pip-prompt {
  color: var(--color-accent);
  user-select: none;
}

.pip-install code {
  color: #e2e8f0;
}

.copy-btn {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1;
  transition: color var(--transition);
  flex-shrink: 0;
}

.copy-btn:hover {
  color: var(--color-accent);
}

.copy-btn.copied {
  color: var(--color-success);
}

/* --- Devicon sizing inside skill tags --- */
.skill-tag i.devicon-python-plain,
.skill-tag i.devicon-cplusplus-plain,
.skill-tag i.devicon-pytorch-plain,
.skill-tag i.devicon-tensorflow-original,
.skill-tag i.devicon-opencv-plain,
.skill-tag i.devicon-docker-plain,
.skill-tag i.devicon-git-plain,
.skill-tag i.devicon-amazonwebservices-original,
.skill-tag i.devicon-googlecloud-plain,
.skill-tag i.devicon-fastapi-plain,
.skill-tag i.devicon-jira-plain,
.skill-tag i.devicon-pandas-plain,
.skill-tag i.devicon-numpy-plain {
  font-size: 1rem;
  vertical-align: middle;
  margin-right: 0.25rem;
}

/* --- Contact form status --- */
.form-status {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  min-height: 1.4em;
}

.form-status.success {
  color: var(--color-success);
}

.form-status.error {
  color: #ef4444;
}

/* --- Responsive: Stats Bar --- */
@media (max-width: 768px) {
  .stats-grid {
    gap: 0;
  }

  .stat-item {
    padding: 0.75rem 1.5rem;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    width: 50%;
  }

  .stat-item:nth-child(odd) {
    border-right: 1px solid rgba(255, 255, 255, 0.12);
  }

  .stat-item:last-child {
    border-bottom: none;
    width: 100%;
  }
}

/* ================================
   Blog Pages
   ================================ */

/* --- Blog Hero --- */
.blog-hero {
  padding: 8rem 0 3rem;
  background: linear-gradient(135deg, var(--color-text-heading) 0%, #1e3a5f 100%);
  color: #fff;
  text-align: center;
}

.blog-hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.blog-hero-sub {
  font-size: 1.05rem;
  opacity: 0.7;
  max-width: 500px;
  margin: 0 auto;
}

/* --- Blog Filters --- */
.blog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 2.5rem 0 2rem;
}

/* --- Blog Grid --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
  padding-bottom: 4rem;
}

/* --- Blog Card --- */
.blog-card {
  background: var(--color-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.blog-card.hidden {
  display: none;
}

.blog-card-img img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.blog-card-placeholder {
  width: 100%;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(6, 182, 212, 0.08));
}

.blog-card-placeholder i {
  font-size: 3rem;
  color: var(--color-primary);
  opacity: 0.3;
}

.blog-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
  flex-wrap: wrap;
}

.blog-category {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.blog-category--project {
  background: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
}

.blog-category--technology {
  background: rgba(6, 182, 212, 0.1);
  color: var(--color-accent);
}

.blog-category--course {
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.blog-category--opensource {
  background: rgba(139, 92, 246, 0.1);
  color: #8b5cf6;
}

.blog-card-body h2 {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.blog-card-body h2 a {
  color: var(--color-text-heading);
  transition: color var(--transition);
}

.blog-card-body h2 a:hover {
  color: var(--color-primary);
}

.blog-card-body > p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
}

.blog-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.read-time {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.read-time i {
  margin-right: 0.25rem;
}

.read-more {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.read-more:hover {
  gap: 0.6rem;
}

/* --- Article Page --- */
.article-page {
  padding: 7rem 0 4rem;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  margin-bottom: 2rem;
  transition: color var(--transition);
}

.article-back:hover {
  color: var(--color-primary);
}

.article-header {
  margin-bottom: 2rem;
  max-width: 760px;
}

.article-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.25;
  margin-top: 0.75rem;
  margin-bottom: 0.75rem;
}

.article-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.article-cover {
  margin-bottom: 2.5rem;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.article-cover img {
  width: 100%;
  max-height: 450px;
  object-fit: cover;
}

/* --- Article Content Typography --- */
.article-content {
  max-width: 760px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-border);
}

.article-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.article-content p {
  margin-bottom: 1.25rem;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.article-content strong {
  color: var(--color-text-heading);
}

.article-content em {
  color: var(--color-text-light);
  background: rgba(37, 99, 235, 0.06);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(37, 99, 235, 0.06);
  color: var(--color-primary);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
}

.article-content pre {
  background: var(--color-text-heading);
  color: #e2e8f0;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.6;
}

.article-content pre code {
  background: none;
  color: inherit;
  padding: 0;
}

.article-content img {
  max-width: 100%;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  margin: 1.25rem 0;
}

.article-content table.shortcut-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
}

.shortcut-table th {
  text-align: left;
  font-weight: 600;
  color: var(--color-text-heading);
  padding: 0.6rem 1rem;
  border-bottom: 2px solid var(--color-border);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.shortcut-table td {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.shortcut-table tr:last-child td {
  border-bottom: none;
}

.shortcut-table code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: rgba(37, 99, 235, 0.06);
  color: var(--color-primary);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.article-content .img-caption {
  font-size: 0.82rem;
  color: var(--color-text-light);
  text-align: center;
  margin-top: -0.75rem;
  margin-bottom: 1.25rem;
  font-style: italic;
}

/* --- Article Nav Links (Prev/Next) --- */
.article-nav-links {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 2.5rem;
  max-width: 760px;
}

.article-nav-link {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
  max-width: 50%;
}

.article-nav-link:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.article-nav-link.next {
  margin-left: auto;
  text-align: right;
}

.article-nav-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
}

.article-nav-title {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-heading);
  line-height: 1.4;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* --- Article Author --- */
.article-author {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  margin: 2.5rem 0;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--color-primary);
  max-width: 760px;
}

.article-author img {
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.article-author strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-text-heading);
  margin-bottom: 0.15rem;
}

.article-author p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin: 0;
}

/* --- Blog Responsive --- */
@media (max-width: 768px) {
  .blog-hero {
    padding: 6.5rem 0 2rem;
  }

  .blog-hero h1 {
    font-size: 1.75rem;
  }

  .blog-grid {
    grid-template-columns: 1fr;
  }

  .article-header h1 {
    font-size: 1.6rem;
  }

  .article-content {
    font-size: 1rem;
  }

  .article-author {
    flex-direction: column;
    text-align: center;
  }
}

/* --- Print Styles --- */
@media print {
  [data-aos] {
    opacity: 1 !important;
    transform: translate(0) scale(1) !important;
  }

  .site-header,
  .hero-bg,
  .hero-social,
  .hero-actions,
  .back-to-top,
  .site-footer,
  .contact-form,
  #portfolio {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
    font-size: 12pt;
  }

  .card {
    box-shadow: none;
    padding: 1rem 0;
  }

  .section {
    padding: 0.5rem 0;
  }

  .hero {
    min-height: auto;
    padding: 2rem 0;
    color: #000;
  }
}